[jira] [Commented] (SOLR-1093) A RequestHandler to run multiple queries in a batch

["Thomas Scheffler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699300#comment-13699300 ] 

Thomas Scheffler commented on SOLR-1093:
----------------------------------------

As said by [~dsmiley] in his [comment|#comment-13620283]
{quote}
I am highly in favor of a scripting request handler in which a script runs that submits the searches to Solr (in-VM) and can react to the results of one request before making another that is formulated dynamically, and can assemble the response data, potentially reducing both the latency and data that would move over the wire if this feature didn't exist.
{quote}

I have a use-case that currently requires for every search I do two more searches that depend on the result of the first search. Doing this on client side requires also two more network roundtrips and the overhead of preparing the searches. An efficient way to specify a script (external file or cdata section) could optimize the time for doing this and may even allow better caching.

Originally I came across this issue to combine the two later request into one. A scriptable RequestHandler would even save this request by moving some simply logic to SOLR.
                
> A RequestHandler to run multiple queries in a batch
> ---------------------------------------------------
>
>                 Key: SOLR-1093
>                 URL: https://issues.apache.org/jira/browse/SOLR-1093
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Noble Paul
>            Assignee: Simon Willnauer
>         Attachments: SOLR-1093.patch
>
>
> It is a common requirement that a single page requires to fire multiple queries .In cases where these queries are independent of each other. If there is a handler which can take in multiple queries , run them in paralll and send the response as one big chunk it would be useful
> Let us say the handler is  MultiRequestHandler
> {code}
> <requestHandler name="/multi" class="solr.MultiRequestHandler"/>
> {code}
> h2.Query Syntax
> The request must specify the no:of queries as count=n
> Each request parameter must be prefixed with a number which denotes the query index.optionally ,it may can also specify the handler name.
> example
> {code}
> /multi?count=2&1.handler=/select&1.q=a:b&2.handler=/select&2.q=a:c
> {code}
> default handler can be '/select' so the equivalent can be
> {code} 
> /multi?count=2&1.q=a:b&2.q=a:c
> {code}
> h2.The response
> The response will be a List<NamedList> where each NamedList will be a response to a query. 

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